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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1966c09851cac40e28feb0987845a555fa1d1dba3452d08046b53bc4a6f07aab' 
  AND token = 'OZRn/bms3E0Js25HOcxu3qAp/rzzCdV7FoIom/ntoRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}